Write a program that performs the basic mathematical operations (+, - , *, /) as Calculator using Layout manager. ( File must be save as: AdditionDemo.java)

import java.awt.event.*;//ActionListener;

//import java.awt.event.ActionEvent;

//import javax.swing.JFrame;

//import javax.swing.JTextField;

//import javax.swing.JLabel;

import javax.swing.*;//JButton;

import java.awt.*;//GridBagLayout;

//import java.awt.GridBagConstraints;

//import java.awt.Insets;

class Addition extends JFrame

{

            JButton b1=new JButton("+");

            JButton b2=new JButton("-");

            JButton b3=new JButton("*");

            JButton b4=new JButton("/");

            //JButton button5=new JButton("=");

            JLabel l1=new JLabel("1st Number: ");

            JLabel l2=new JLabel("2nd Number: ");

            JLabel l3=new JLabel("Result");

            JTextField t1=new JTextField("",10);

            JTextField t2=new JTextField("",10);

            JTextField t3=new JTextField("",10);

            GridBagConstraints c=new GridBagConstraints();

            GridBagLayout l=new GridBagLayout();

            String s;

            int a,b;

             Addition()

            {

                        super("Addition of 2 number's");

                        setLayout(l);

                        c.gridx=0;

                        c.gridy=0;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(l1,c);

                        add(l1);

                        c.gridx=1;

                        c.gridy=0;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(t1,c);

                        add(t1);

                        c.gridx=0;

                        c.gridy=1;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(l2,c);

                        add(l2);

                        c.gridx=1;

                        c.gridy=1;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(t2,c);

                        add(t2);

                        c.gridx=0;

                        c.gridy=2;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(l3,c);

                        add(l3);

                        c.gridx=1;

                        c.gridy=2;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(t3,c);

                        add(t3);

                        c.gridx=1;

                        c.gridy=3;

                        c.insets=new Insets(0,0,0,76);

                        l.setConstraints(b1,c);

                        add(b1);

                        c.gridx=1;

                        c.gridy=3;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(b2,c);

                        add(b2);

                        c.gridx=1;

                        c.gridy=3;

                        c.insets=new Insets(0,76,0,0);

                        l.setConstraints(b3,c);

                        add(b3);

                        c.gridx=2;

                        c.gridy=3;

                        c.insets=new Insets(0,0,0,0);

                        l.setConstraints(b4,c);

                        add(b4);

                        /*c.gridx=1;

                        c.gridy=3;

                        c.insets=new Insets(0,76,0,0);

                        layout.setConstraints(button5,c);

                        add(button5);*/

                        Cal p=new Cal();

                        b1.addActionListener(p);

                        b2.addActionListener(p);

                        b3.addActionListener(p);

                        b4.addActionListener(p);

                        //button5.addActionListener(p);

            }

             class Cal implements ActionListener

            {

                        public void actionPerformed(ActionEvent event)

                        {

                                    //if(event.getActionCommand()=="+"||event.getActionCommand()=="-"||event.getActionCommand()=="*"||event.getActionCommand()=="/")

                                    //{

                                                  a=Integer.valueOf(t1.getText());

                                                s=event.getActionCommand();

                                    //}

                                    //if(event.getActionCommand()=="=")

                                    //{

                                     b=Integer.valueOf(t2.getText());

                                    if(s=="+")

                                    t3.setText(String.valueOf(a)+"+"+String.valueOf(b)+"="+String.valueOf(a+b));

                                     if(s=="-")

                                    t3.setText(String.valueOf(a)+"-"+String.valueOf(b)+"="+String.valueOf(a-b));

                                     if(s=="*")

                                    t3.setText(String.valueOf(a)+"*"+String.valueOf(b)+"="+String.valueOf(a*b));

                                     if(s=="/")

                                    t3.setText(String.valueOf(a)+"/"+String.valueOf(b)+"="+String.valueOf(a/b));

                        //}

                        }

            }

}

 class AdditionDemo

{

            public static void main(String args[])

            {

                        Addition addition=new Addition();

                        addition.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                        addition.setSize(400,300);

                        addition.setVisible(true);

            }

}

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